1 mach (M) = 1225 kilometer per hour (kph).
Mach (M) is a unit of Speed used in Metric system.
Kilometer Per Hour (kph) is a unit of Speed used in Metric system.
Mach speed can be marked as Ma and Mach number. At Standard Sea Level conditions (temperature of 15 degrees Celsius), the speed of sound = 1 Mach = 340.3 m/s (1225 km/h, or 761.2 mph, or 661.5 knots, or 1116 ft/s). Kilometers per hour also can be marked as km/h and Kilometres per hour(alternative British English spelling in UK).